How many AU is 1 foot?

One foot equals approximately 2.037 x 10-12 AU. A foot is about 2 trillionths of an AU.

How many feet are in 1 AU?

One AU contains approximately 4.908 x 1011 feet (about 491 billion feet).

Is this conversion used in aerospace?

No. Aerospace uses feet for aircraft altitude and AU or kilometers for orbital distances. Direct foot-to-AU conversion is never needed.

Feet to Astronomical Units (ft to au) Converter

1 ft = 2.03746 × 10⁻¹² au

1 Foot equals 2.03746 × 10⁻¹² Astronomical Units (1 ft = 2.03746 × 10⁻¹² au). Convert Feet to Astronomical Units with formula, table, and examples.

One foot equals approximately 2.037 x 10^-12 astronomical units. A 6-foot person stands at about 1.22 x 10^-11 AU. The foot measures personal heights and room sizes; the AU measures the Earth-Sun distance. These scales are separated by about 12 orders of magnitude.

How to Convert Feet to Astronomical Units

au = ft × 2.03746 × 10⁻¹²

Multiply the value in Feet by 2.03746 × 10⁻¹²

Take your value in Feet
Multiply by 2.03746 × 10⁻¹²
Read the result in Astronomical Units

Common Feet to Astronomical Units Conversions

Feet (ft)	Astronomical Units (au)	Status
1,000,000,000,000 ft	2.0375 au
2,000,000,000,000 ft	4.0749 au
5,000,000,000,000 ft	10.1873 au
10,000,000,000,000 ft	20.3746 au
25,000,000,000,000 ft	50.9366 au
50,000,000,000,000 ft	101.8731 au
100,000,000,000,000 ft	203.7462 au
500,000,000,000,000 ft	1,018.7311 au
1 × 10¹⁵ ft	2,037.4622 au

Good to Know About Feet to Astronomical Units Conversion

American aviation uses feet exclusively for altitude. Space science uses AU for solar system distances. The boundary between 'feet world' and 'AU world' is roughly the edge of Earth's atmosphere, about 328,000 feet (100 km) up.

Feet to Astronomical Units: What You Need to Know

The Earth-Sun distance (1 AU) is about 4.908 x 10¹¹ feet (491 billion feet). Mount Everest at 29,032 feet is only 0.0000000592 AU high. A commercial airplane at 35,000 feet cruises at 0.0000000713 AU. These comparisons show how small even the tallest objects on Earth are at the AU scale.

What is a Foot? ft

An imperial unit of length equal to 12 inches or 0.3048 meters. Used in the US and UK for height, altitude, and construction.

Imperial Us-customary height altitude real estate

Learn more about Foot →

What is a Astronomical Unit? au

Exactly 149,597,870,700 meters by IAU 2012 definition. Roughly the average distance from the Earth to the Sun. Used for distances within our solar system.

Astronomical solar system distances astronomy planetary science

Learn more about Astronomical Unit →

Going the other way? Use our Astronomical Units to Feet converter.

Feet to Astronomical Units FAQ

One foot equals approximately 2.037 x 10^-12 AU. A foot is about 2 trillionths of an AU.
One AU contains approximately 4.908 x 10¹¹ feet (about 491 billion feet).
No. Aerospace uses feet for aircraft altitude and AU or kilometers for orbital distances. Direct foot-to-AU conversion is never needed.

Non-Frequently Asked Questions About Feet to Astronomical Units

Questions nobody should ask - but someone did.

The Moon is about 0.00257 AU or about 1.26 billion feet away. If you walked at 3 feet per step, that would be about 420 million steps. At 10,000 steps per day, the walk would take about 115,000 years. Bring extra shoes.
A commercial flight at 35,000 feet is about 7.13 x 10^-8 AU. That is 71 billionths of an AU. From the Sun's perspective, you are still on the ground. Altitude is impressive to humans but invisible to astronomy.
One foot is about 2.04 x 10^-12 AU. At the Earth's surface, you are already about 1 AU from the Sun. Growing 1 foot adds 0.0000000002% to that distance. The Sun does not notice your growth spurt.